diff --git a/src/spaces.h b/src/spaces.h
index a6b8ea4..04e0c79 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -756,6 +756,7 @@
   HeapObjectIterator(PagedSpace* space,
                      Address start,
                      HeapObjectCallback size_func);
+  HeapObjectIterator(Page* page, HeapObjectCallback size_func);
 
   inline HeapObject* next() {
     return (cur_addr_ < cur_limit_) ? FromCurrentPage() : FromNextPage();
@@ -1039,6 +1040,11 @@
   // Freed pages are moved to the end of page list.
   void FreePages(Page* prev, Page* last);
 
+  // Deallocates a block.
+  virtual void DeallocateBlock(Address start,
+                               int size_in_bytes,
+                               bool add_to_freelist) = 0;
+
   // Set space allocation info.
   void SetTop(Address top) {
     allocation_info_.top = top;
@@ -1097,6 +1103,8 @@
   // Returns the page of the allocation pointer.
   Page* AllocationTopPage() { return TopPageOf(allocation_info_); }
 
+  void RelinkPageListInChunkOrder(bool deallocate_blocks);
+
  protected:
   // Maximum capacity of this space.
   int max_capacity_;
@@ -1814,6 +1822,10 @@
     }
   }
 
+  virtual void DeallocateBlock(Address start,
+                               int size_in_bytes,
+                               bool add_to_freelist);
+
   // Prepare for full garbage collection.  Resets the relocation pointer and
   // clears the free list.
   virtual void PrepareForMarkCompact(bool will_compact);
@@ -1888,6 +1900,9 @@
 
   virtual void PutRestOfCurrentPageOnFreeList(Page* current_page);
 
+  virtual void DeallocateBlock(Address start,
+                               int size_in_bytes,
+                               bool add_to_freelist);
 #ifdef DEBUG
   // Reports statistic info of the space
   void ReportStatistics();
@@ -2137,6 +2152,11 @@
   // space, may be slow.
   Object* FindObject(Address a);
 
+  // Finds a large object page containing the given pc, returns NULL
+  // if such a page doesn't exist.
+  LargeObjectChunk* FindChunkContainingPc(Address pc);
+
+
   // Iterates objects covered by dirty regions.
   void IterateDirtyRegions(ObjectSlotCallback func);